EP 1999182 A1 20081210 - METHOD FOR CHANGING THE PREDEFINED MEAN MOLECULAR WEIGHT Mn DURING THE CONTINUOUS PRODUCTION OF POLYTETRAHYDROFURANES OR THF COPOLYMERS
Title (en)
METHOD FOR CHANGING THE PREDEFINED MEAN MOLECULAR WEIGHT Mn DURING THE CONTINUOUS PRODUCTION OF POLYTETRAHYDROFURANES OR THF COPOLYMERS
Title (de)
VERFAHREN ZUR ÄNDERUNG DES VORGEGEBENEN MITTLEREN MOLEKULARGEWICHT Mn BEI DER KONTINUIERLICHEN HERSTELLUNG VON POLYTETRAHYDROFURANEN ODER THF COPOLYMEREN
Title (fr)
PROCÉDÉ POUR MODIFIER LE POIDS MOLÉCULAIRE MOYEN PRÉDÉFINI Mn LORS DE LA FABRICATION EN CONTINU DE POLYTÉTRAHYDROFURANNES OU DE COPOLYMÈRES DE TÉTRAHYDROFURANNE
Publication
Application
Priority
- EP 2007063571 W 20071210
- EP 07100828 A 20070119
- EP 07857306 A 20071210
Abstract (en)
[origin: WO2008086919A1] The object of the present invention is a method for changing the predefined mean molecular weight Mn during the continuous production of polytetrahydrofurane, or tetrahydrofurane copolymers, the monoesters or diesters of polytetrahydrofurane, or tetrahydrofurane copolymers, by the polymerization of tetrahydrofurane in the presence of telogen and/or a comonomer on an acid catalyst, wherein: a) the mol ratio of telogen to tetrohydrofurane, or to tetrahydrofurane and the comonomer, is changed, b) then the mean molecular weight of at least one sample is determined, c) as long as the mean molecular weight determined in this way deviates from the molecular weight to be achieved by the change, the previously formed polytetrahydrofurane, or the tetrahydrofurane copolymers, the monoesters or diesters of the polytetrahydrofurane, or tetrahydrofurane copolymers, are at least partially depolymerized on an acid catalyst, and d) the tetrahydrofurane recaptured by means of depolymerization is returned at least partially to the polymerization process.
IPC 8 full level
C08G 65/20 (2006.01)
CPC (source: EP KR US)
C08G 65/20 (2013.01 - EP KR US); C08G 65/2657 (2013.01 - EP US); C08G 65/266 (2013.01 - EP US); C08G 65/2696 (2013.01 - EP US); C08G 65/46 (2013.01 - KR)
Citation (search report)
See references of WO 2008086919A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
WO 2008086919 A1 20080724; CN 101432337 A 20090513; CN 101432337 B 20110817; EP 1999182 A1 20081210; EP 1999182 B1 20120926; JP 2010516822 A 20100520; KR 101457227 B1 20141031; KR 20090107912 A 20091014; MY 147424 A 20121214; TW 200902588 A 20090116; TW I435891 B 20140501; US 2010240864 A1 20100923; US 8138283 B2 20120320
DOCDB simple family (application)
EP 2007063571 W 20071210; CN 200780014749 A 20071210; EP 07857306 A 20071210; JP 2009545841 A 20071210; KR 20087025413 A 20071210; MY PI20084056 A 20081010; TW 97101848 A 20080117; US 29515207 A 20071210